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Defining and Mapping Servlets - JBoss

24 September, 2020

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Defining and Mapping Servlets -JBoss

In WEB-INF/web.xml file: Define a servlet with <servlet> where <servlet-name> points to a fully qualified <servlet-class> Optionally initialize with <init-param>-s Optionally <load-on-startup> Map a defined servlet with <servlet-mapping> where <url-pattern> points to previously specified <servlet-name> Map under multiple <url-pattern>-s if needed

<servlet>
<servlet-name>IPLoggerServlet</servlet-name>
<servlet-class>example.servlet.IPLoggerServlet</servlet-class>
<init-param>
<param-name>file</param-name>
<param-value>/WEB-INF/ip.log</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>

<servlet-mapping>
<servlet-name>IPLoggerServlet</servlet-name>
<url-pattern>/ip</url-pattern>
</servlet-mapping>

<servlet-mapping>
<servlet-name>IPLoggerServlet</servlet-name>
<url-pattern>/logmyip</url-pattern>
</servlet-mapping>

Defining and Mapping Filters in Jboss In WEB-INF/web.xml file:

  1. Define a filter with <filter> where <filter-name> points to a fully qualified <filter-class>
    1. Optionally initialize with <init-param>-s
  2. Map a defined filter with <filter-mapping> where <url-pattern> points to previously specified <filter-name>
    1. Map under multiple <url-pattern>-s if needed
    2. Map with /* to apply to all requests
<!ELEMENT filter (icon?, filter-name, display-name?, description?, filter-class, init-param*)>
<filter>
<filter-name>Logger</filter-name>
<filter-class>example.servlet.AccessLogFilter</filter-class>
</filter>

<!ELEMENT filter-mapping (filter-name, (url-pattern | servlet-name))>
<filter-mapping>
<filter-name>Logger</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

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